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Yb3+/Er3+共掺锗碲酸盐玻璃上转换发光增强机理的研究
引用本文:杨中民,张勤远,刘粤惠,姜中宏. Yb3+/Er3+共掺锗碲酸盐玻璃上转换发光增强机理的研究[J]. 物理学报, 2005, 54(5): 2013-2018
作者姓名:杨中民  张勤远  刘粤惠  姜中宏
作者单位:华南理工大学光通信材料研究所,特种功能材料制备新技术教育部重点实验室,广州,510641
基金项目:国家自然科学基金 (批准号 :60 3 0 70 0 4,5 0 40 2 0 0 7),广东省科技攻关项目 (批准号 :2 0 0 2B1160 4),广东省自然科学基金 (批准号 :0 13 0 13 )资助的课题 .~~
摘    要:玻璃的最大声子能量决定稀土离子的上转换发光强度,但本研究发现:Yb^3 /Er^3 共掺锗碲酸盐玻璃在980nm LD抽运下,上转换荧光强度随着Bi2O3对PbO的取代和碱金属离子半径的增大而明显增强.而Raman光谱显示基质玻璃的最大声子能量并不随Bi2O3对PbO的取代和碱金属离子半径的增大而变化,但玻璃的最大声子密度随着Bi2O3对PbO取代和碱金属离子半径的增大而降低.从玻璃无辐射跃迁概率的角度,通过分析表明,最大声子密度的降低是玻璃上转换发光强度增强的主要原因.

关 键 词:掺饵玻璃 上转换发光 最大声子能量 短波长固体激光器

Mechanism of the enhanced upconversion emissions in Yb3+/Er3 + -codoped germanate-tellurite glasses
Yang Zhong-Min,Zhang Qin-Yuan,Liu Yue-Hui,Jiang Zhong-Hong. Mechanism of the enhanced upconversion emissions in Yb3+/Er3 + -codoped germanate-tellurite glasses[J]. Acta Physica Sinica, 2005, 54(5): 2013-2018
Authors:Yang Zhong-Min  Zhang Qin-Yuan  Liu Yue-Hui  Jiang Zhong-Hong
Abstract:The intensity of upconversion emissions of rare-)earth ions is determined by the maximum phonon energy of glass host. In this paper the intensities of upconversion emissions in Yb 3 /Er 3 -)codoped germanate-)tellurite glasses upon the excitation of 980nm laser diode were extremely enhanced by replacing PbO with Bi 2O 3 and increasing the size of alkali-)metal ions. Raman spectra show that the maximum phonon energies of the glass hosts investigated keep unchanged, while the maximum phonon density decreases on substituting Bi 2O 3 for PbO and increasing the size of alkali-)metal ions. Based on the non-)radiative decay rate, it is found that the maximum phonon density is the main reason for the enhancement of upconversion emissions in Yb 3 /Er 3 -)codoped germanate-)tellurite glasses.
Keywords:Er~(3 ) -doped glasses   upconversion luminescence   maximum phonon energy
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